Development of the nervous system and cognitive functions
The first years of life are a critical period for brain development. During this time, a colossal formation of neural connections occurs (up to 1.8 million synapses), creating the structural basis of the central nervous system for life.
Key processes in the nervous system:
- Myelination of peripheral nerves.
- Development of associative connections and the system of active internal inhibition.
- Improvement of autonomic regulation.
Multisensory stimulation is critically important for the proper formation of neural pathways. Impulses from various sense organs integrate cortical areas into a single system, ensuring normal development of perception and communication skills.
Maturation of internal organs and the skeleton
Parallel to body growth, structural maturation of internal organs occurs. Hepatocytes and nephrons are actively formed in the liver and kidneys, and the functioning of enzymatic cascades, the digestive tract, and endocrine glands stabilizes.
The skeletal system undergoes a remodeling phase. Primary woven bone undergoes resorption, and a stronger and more mature lamellar bone is formed in its place.
Immune reactivity and nutrition
In the first months, the child's protection depends on passive immunity, the basis of which is maternal antibodies. Their level is maintained through natural (breast) feeding. Gradually, the body begins to react independently to environmental antigens.
Irrational artificial feeding (unadapted formulas) and an aggressive environment can disrupt homeostasis and distort the immune response. Due to immune immaturity, acute processes easily become chronic. Any dietary errors quickly deplete the infant's reserves, leading to nutrition-dependent pathologies such as iron-deficiency anemia, rickets, or dystrophy. The growing body vitally needs plastic materials (complete proteins) and micronutrients.
Constitution and homeostasis lability
Early age is characterized by instability of neuroendocrine regulation and metabolism. Because of this, even ordinary stimuli can provoke pathological reactions.
The individual adaptation scenario is determined by constitution—a set of morphofunctional characteristics inherited or acquired in utero. Deviations from the norm are referred to as diatheses (constitutional anomalies).
Diathesis is a multifactorial predisposition to certain diseases. Depending on external triggers, diathesis can develop into a true disease or resolve as the child matures. For example, exudative-catarrhal diathesis manifests as a tendency of the skin and mucous membranes to inflammatory processes with peeling and exudate discharge.
Class and exam questions
What happens to bone tissue in the first year of life?
Remodeling takes place: primary fibrous bone is destroyed and replaced by more mature lamellar bone tissue.
How is the newborn's immunity maintained?
Protection is provided by passive immunity—maternal antibodies, which are supplied and maintained through natural breastfeeding.
Why is multisensory stimulation important?
Diverse impact on sense organs is necessary for laying down neural pathways and connecting the cerebral cortex areas into a single system, which is important for emotional and social development.
What is diathesis (constitutional anomaly)?
This is a polygenically inherited predisposition of the body to certain diseases, which can manifest when exposed to environmental triggers.
What else to study on this topic
- Stages of myelination of peripheral nerve fibers
- Histological maturation of nephrons and hepatocytes
- Pathogenesis of nutrition-dependent diseases (anemia, rickets)
- Criteria for exudative-catarrhal diathesis
- Transition of diathesis into a true disease (role of triggers)
Master the entire topic in the Pediatrics course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on "Morphofunctional maturation in the first year of life" and 3,738 more pages of the subject
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 71 video lessons on the subject
Other topics in "Chapter 3. Adaptation, Early Childhood Nutrition, Rickets"
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.